import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        String a = koko.nextLine();
        int now=1;
        if(a.length()==0){
            now = 1;
        }else{
           char[] b = a.toCharArray();
           for(int i=0; i<b.length; i++){
               if(b[i]=='L'){
                   now = now*2;
               }else{
                   now = 1+now*2;
               }
            } 
        }
        
        System.out.println(now);
    }
}